tipc: Resetting bearer general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 4455 Comm: syz.0.36 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:120 [inline] RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:168 [inline] RIP: 0010:fq_codel_enqueue+0xd2d/0x1590 net/sched/sch_fq_codel.c:230 Code: 24 08 48 8b 44 24 20 80 3c 10 00 74 12 4c 89 ef e8 18 37 b8 f9 48 ba 00 00 00 00 00 fc ff df 4d 8b 65 00 4c 89 e0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 e7 e8 f5 36 b8 f9 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc9000310f1c0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 1ffff92000621eac RCX: 1ffff1100c08245a RDX: dffffc0000000000 RSI: 00000000000079ae RDI: 00000000000079af RBP: ffffc9000310f310 R08: dffffc0000000000 R09: fffffbfff1ff6e32 R10: fffffbfff1ff6e32 R11: 1ffffffff1ff6e31 R12: 0000000000000000 R13: ffff888060412800 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f033d5ac6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000001c0 CR3: 000000005b326000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_enqueue include/net/sch_generic.h:832 [inline] sfb_enqueue+0x9e0/0x17d0 net/sched/sch_sfb.c:405 dev_qdisc_enqueue+0x48/0x210 net/core/dev.c:3852 __dev_xmit_skb net/core/dev.c:3936 [inline] __dev_queue_xmit+0xd7e/0x2ed0 net/core/dev.c:4253 tipc_l2_send_msg+0x30a/0x3c0 net/tipc/bearer.c:518 tipc_bearer_xmit_skb+0x292/0x3c0 net/tipc/bearer.c:577 tipc_disc_reset+0x52a/0x830 net/tipc/discover.c:419 tipc_l2_device_event+0x40c/0x5b0 net/tipc/bearer.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_mtu net/core/dev.c:2098 [inline] dev_set_mtu_ext+0x432/0x610 net/core/dev.c:8995 dev_set_mtu+0x41/0xc0 net/core/dev.c:9016 dev_ifsioc+0x47d/0xe70 net/core/dev_ioctl.c:331 dev_ioctl+0x55f/0xe50 net/core/dev_ioctl.c:587 sock_do_ioctl+0x222/0x2f0 net/socket.c:1154 sock_ioctl+0x4ed/0x6e0 net/socket.c:1257 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f033f786be9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f033d5ac038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f033f9ae180 RCX: 00007f033f786be9 RDX: 0000200000002280 RSI: 0000000000008922 RDI: 0000000000000005 RBP: 00007f033f809e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f033f9ae218 R14: 00007f033f9ae180 R15: 00007ffd6d554108 Modules linked in: ---[ end trace f770c5334731169f ]--- RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:120 [inline] RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:168 [inline] RIP: 0010:fq_codel_enqueue+0xd2d/0x1590 net/sched/sch_fq_codel.c:230 Code: 24 08 48 8b 44 24 20 80 3c 10 00 74 12 4c 89 ef e8 18 37 b8 f9 48 ba 00 00 00 00 00 fc ff df 4d 8b 65 00 4c 89 e0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 e7 e8 f5 36 b8 f9 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc9000310f1c0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 1ffff92000621eac RCX: 1ffff1100c08245a RDX: dffffc0000000000 RSI: 00000000000079ae RDI: 00000000000079af RBP: ffffc9000310f310 R08: dffffc0000000000 R09: fffffbfff1ff6e32 R10: fffffbfff1ff6e32 R11: 1ffffffff1ff6e31 R12: 0000000000000000 R13: ffff888060412800 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f033d5ac6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000001c0 CR3: 000000005b326000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 24 08 and $0x8,%al 2: 48 8b 44 24 20 mov 0x20(%rsp),%rax 7: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) b: 74 12 je 0x1f d: 4c 89 ef mov %r13,%rdi 10: e8 18 37 b8 f9 call 0xf9b8372d 15: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 1c: fc ff df 1f: 4d 8b 65 00 mov 0x0(%r13),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 4c 89 e7 mov %r12,%rdi 33: e8 f5 36 b8 f9 call 0xf9b8372d 38: 48 rex.W 39: ba 00 00 00 00 mov $0x0,%edx 3e: 00 fc add %bh,%ah